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Processing pipeline for the qualitative interview data. API: application programming interface; NLU: natural language understanding; Q1: Question 1 (“Do you ever feel lonely, and if so, how often?”); Q2: Question 2 (“What does loneliness feel like to you? What is your general mood during that time?”); Q3: Question 3 (“Why do you think others may feel lonely?”); TF-IDF: term frequency – inverse document frequency.
